Don't know anything about chiggers. Frankly, though, from what I know about bed bugs, you should be glad if it is chiggers
Do either of these look appropriate? (Chigger on the top, bed bug on the bottom)
If it's bed bugs, the bites don't always appear right away. That would explain why sometimes you first notice them at other times and places in the day. The reason I say you should be glad if it's chiggers and not bed bugs is because bug bombs are typically ineffective against bed bugs. In fact, getting rid of them (especially if the infestation is as bad as this one would seem to be) typically requires buying a new mattress, etc, washing and bagging ALL of your clothes, calling in a professional exterminator, etc.
So, here's to hoping it's chiggers. Those guys look (and sound) pretty nasty, but at least they won't be as expensive to get rid of
